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Exploration of combustion instability triggering using Large Eddy Simulation of a multiple injector Liquid Rocket Engine

Urbano, Annafederica and Selle, Laurent and Staffelbach, Gabriel and Cuenot, Bénédicte and Schmitt, Thomas and Ducruix, Sébastien and Candel, Sébastien Exploration of combustion instability triggering using Large Eddy Simulation of a multiple injector Liquid Rocket Engine. (2016) Combustion and Flame, vol. 169. pp. 129-140. ISSN 0010-2180

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Official URL: http://dx.doi.org/10.1016/j.combustflame.2016.03.020

Abstract

This article explores the possibility of analyzing combustion instabilities in liq- uid rocket engines by making use of Large Eddy Simulations (LES). Calculations are carried out for a complete small-scale rocket engine, including the injection manifold thrust chamber and nozzle outlet. The engine comprises 42 coaxial injectors feeding the combustion chamber with gaseous hydrogen and liquid oxy- gen and it operates at supercritical pressures with a maximum thermal power of 80 MW. The objective of the study is to predict the occurrence of transverse high-frequency combustion instabilities by comparing two operating points fea- turing different levels of acoustic activity. The LES compares favorably with the experiment for the stable load point and exhibits a nonlinearly unstable trans- verse mode for the experimentally unstable operating condition. A detailed analysis of the instability retrieves the experimental data in terms of spectral features. It is also found that modifications of the flame structures and of the global combustion region configuration have similarities with those observed in recent model scale experiments. It is shown that the overall acoustic activity mainly results from the combination of one transverse and one radial mode of the chamber, which are also strongly coupled with the oxidizer injectors.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Combustion and Flame website : http://www.sciencedirect.com/science/article/pii/S0010218016300372
HAL Id:hal-01320509
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Laurent SELLE
Deposited On:24 May 2016 06:33

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